shows typical coulograms and depict variation of electrolysis charge as well as current as a function of time for the electro-reduction of Ga(III) to Ga and electrooxidation of Ga to Ga(III), respectively. It can be seen that the electro-reduction current initially shoots to about 14mA within 25 s and shows an exponential decreases to a value of about
1mA after 1400 s and remains stable afterwards. Higher level of background current was attributed to the hydrogen evolution reaction at potential of−0.95V. This is also supported by reduction coulogram shown in Fig. 1(a), where the integrated current (coulombs) is observed to increase even after 1400 s. It can be seen in Fig. 1(b) that the initial oxidation current is about five times higher as compared to the reduction current observed in Fig. 1(a) and the background electrolysis current falls to almost zero after 300 s. This suggests that the amount of Ga(III) reduced in the reduction step is quantitatively oxidized back to Ga(III) in oxidation step and that oxidation is a much faster electrode process as compared to reduction.